Beelzebub is commonly understood to be a name for the devil. Why the author might have chosen this title? What new insight does this give me into the meaning of "the lord of the flies"?

As an allegory about human nature and society, Lord of the Flies draws upon Judeo-Christian mythology to elaborate on the novel's sociological and political hypothesis. The title has two meanings, both charged with religious significance. The first is a reference to a line from King Lear, "As flies to wanton boys, are we to gods." The second is a reference to the Hebrew name Ba'alzevuv, or in its Greek form Beelzebub, which translates to "God of the Flies" and is synonymous with Satan. For Golding however, the satanic forces that compel the shocking events on the island come from within the human psyche rather than from an external, supernatural realm as they do in Judeo-Christian mythology. Golding thus employs a religious reference to illustrate a Freudian concept: the Id, the amoral instinct that governs the individual's sense of sheer survival, is by nature evil in its amoral pursuit of its own goals. The Lord of the Flies, that is, the pig's head on a stick, directly challenges the most spiritually motivated character on the island, Simon, who functions as a prophet-martyr for the other boys.